Update setup script.
Update setup script.

Summary: Closes https://github.com/facebook/jest/pull/836

Differential Revision: D3097412

fb-gh-sync-id: 6c9ca63e3d5a11ba92591d8e5548a420487f4a28
fbshipit-source-id: 6c9ca63e3d5a11ba92591d8e5548a420487f4a28

Daniel15/jest,sampepose/jest,Daniel15/jest,ide/jest,mpontus/jest,skovhus/jest,ide/jest,facebook/jest,skawian/jest,sampepose/jest,Daniel15/jest,aaron-goshine/jest,facebook/jest,alvinsj/jest,mpontus/jest,bookman25/jest,cpojer/jest,skovhus/jest,blainekasten/jest,aaron-goshine/jest,blainekasten/jest,razh/jest,bookman25/jest,skawian/jest,cpojer/jest,bookman25/jest,aaron-goshine/jest,razh/jest,cpojer/jest,facebook/jest,blainekasten/jest,mpontus/jest,ide/jest,skovhus/jest,alvinsj/jest